Get Modified Fields in RowPersisted Event - acumatica

Question

In RowPersisted event. Is there a way to know which fields were updated ? I have a customization in my RowPersisted event. But I only want to execute it if certain field(s) were actually modified. At the moment the event is firing unnecessarily as it reacts every time its saved.
TIA
UPDATE
Just to add. My customization has got nothing to do with the field values nor overriding the saving itself. I'm just using the RowPersisted event to kick off my customization.

Answer 1

If you want to compare the current row with any changes to the row with unchanged values (as it was from last persist) you can use a cache instance and call GetOriginal.
For example using an extension on sales order to check to see if the order qty or order total changed...
[PXOverride]
public virtual void Persist(Action del)
{
// Current object with any changed values
var salesOrder = Base.Document.Current;
// Unchanged object as it was set from the last save/persist
var unchangedSalesOrder = Base.Document.Cache.GetOriginal(salesOrder);
if (!Base.Document.Cache.ObjectsEqual<SOOrder.orderQty, SOOrder.curyOrderTotal>(salesOrder, unchangedSalesOrder))
{
PXTrace.WriteInformation("My values changed");
}
del?.Invoke();
}
Edit: I think at some point the GetOriginal was not publicly accessible. Not sure which version but if you cannot find this call it could be you are on an older version of Acumatica where this call cannot be used.

Answer 2

Below is the description of the RowPersisted event from https://help-2018r2.acumatica.com
public delegate void PXRowPersisted(PXCache sender, PXRowPersistedEventArgs e )
Parameters
sender (Required). The cache object that raised the event
e (Required). The instance of the PXRowPersistedEventArgs type that holds data for the >RowPersisted event
The RowPersisted event is triggered in the process of committing changes to the database for every data record whose status is Inserted, Updated, or Deleted. The RowPersisted event is triggered twice:
When the data record has been committed to the database and the status of the transaction scope (indicated in the e.TranStatus field) is Open.
When the status of the transaction scope has changed to Completed, indicating successful committing, or Aborted, indicating that a database error has occurred and changes to the database have been dropped.
The e parameter has the only Row property which is the current modified record.
You can check your condition on the e.Row and execute your code.
You should not use PXRowPersisted event for modifying values on the Completed transaction. If you need to modify values before/after save the best practice is to override Persist and use PXTransactionScope and invocation of the baseMethod, see example below:
[PXOverride]
public void Persist(Action baseMethod)
{
using(PXTransactionScope sc = new PXTransactionScope())
{
//... do your code here
baseMethod?.Invoke();
//... or here
sc.Complete();
}
}
UPDATED
Ideally, you should follow the rules below:
if you want to update the values of other fields of your record during the update of some fields then you should use the corresponding PXFieldUpdated event handler.
If you want to prevent saving of the record depending on some conditions of the field values of your record you should you PXRowPersisting event handler.
If you want to update DAC/Table of other maintenance/entry you should do it in the Persist method.